"""
"""
print(3)
print(1)
print(2)

# 非零为真 非空为真
if {1:2}:
    print("这是条件")
else:
    print("这是条件不成立")
    

i = 1
while i <= 10:
    print(i)
    i += 1 
print("End")


i = 10
while i >= 1:
    print(i)
    i -= 1
print("End")








